. ♪ i was 18 years old >> some, like brian lautenslager, are part of a permanent population slated toir entire sentences at brushy. >> i've been in prison all together 18 years. i come in when i was 18, got out at 24, came back at 25, now i'm 36. going on 37. >> lautenslager is serving a 90-year sentence for robbery and criminal intent to commit murder. >> this is a song i wrote a few years ago. every year i change the amount of years it's been since i've been in prison. ♪ it's been 18 long years ♪ in this old cold prison sometimes i feel so all alone ♪ sweet mountain of home ♪ ♪ so far away ♪ i'm lonesome and blue ♪ that's all i can say >> one of the oldest inmates in brushy mountain's permanent population is james slagle. slagle is serving a 318-year sentence for murder and has been here longer than any other inmate. >> i've been in the tennessee prison system without getting out, i started my 39th year three weeks ago today. and i spent 24 years of that time here at brushy mountain. i decided, jim, you've got to become something else. and so i looked into me and saw the ugliness. i